Expansion-bolt.



G. E. ROHMBR, J. F. BOORAEM L R. MORLEY.

EXPANSION BOLT.

APPLIOATION FILED 1123.8, 1912.

1 1 20,409, Patented Dec. 8, 1914.

-llllllllllll ATTORNEYS jg/w UNITED STATES PATENT OFFICE.

GABRIEL E. BOHMER, OF- WOODSIDE, NEW.YORK, JOHN FRANCIS BOORAEM, OFGREEN-V WICH, CONNECTICUT, AND RALPH MOBLEY, O1? BROOKLYN, NEW YORK,ASSIGNOBS TO THE BOORAEM & ROHMERPATENT COMPANY, A CORPORATION OF NEWYORK.

EXPANSION-BOLT.

Speoication of Lettersl'atent.

Patented Dec. 8, 1914.

Application filed February 8. 191,2. Serial No. 676,342.

necticut, and RALPH MoRLEY, a citizen ofA the United States of America,residing in the borough of Brooklyn, county of Kings, and State of NewYork, have invented certain new and useful Improvements inExpansion-Bolts, of which thev following is a specification.

This invention relates to expansion bolts and has for its object toprovide means by which the male or4 expanding member is keyed to thefemale'or expansible member after `the unit 'has been assembled so as toprevent the disengagement of the members offthe unit after theirengagement and at ther same time permit the bolt to be withdrawn fromthe unit.

Forthis purpose our invention consists of an' improved expanding memberhaving recesses therein adapted to be engaged by the represents anend-view of an expanding member embodying our invention, Fig. 2represents a side-view, partly in section and partly in elevation of thesame member, Fig. 3 shows an end-view of an expansible member -providedwith a friction-rim made in accordance with our invention, Fig. 4: is aside-view, partly in elevation and partly in section of the form shownin Fig. 3, Fig. 5 is a side-view, partly in section, partly inelevation, of another embodiment of the` expanding member, Fig. 6 is anend-view of the same, Fig. 7 is a side-view, partly in section andpartly in elevation of still another embodiment, Fig. 8 is an end-viewof the'same, Figs. 9 and 10 are respectively, an end-view and a sectionof another embodi- Ament, Fig. 11 is an end-view, Fig. 12 is a section,partly in section and partly in elevation, of a modified form ofexpanding member, Fig. 13 is an end-view, Fig. 14 is a View of thedrawings in section and partly in elevation, of still another modifiedform of expanding member, Fig. 15 is an end# view, Flg. 16 is a section,partly in section and partly 1n elevation of still another modihedform,Fig. 17 is an end-view, Fig. 131s a view partly in section and partly inelevatlon, o f another modified form, Fig. 19 1s an end-view, Fig. 2O isa view, partly in `section and partl in elevation, of another modifiedform, s owing a recess of large curvature, Fig. 21 is a side-view,partly in section and partly in elevation, of a bolt having twoexpansible members back to back engaged-by two expanding members,provided with the improved recess, and Fig. 22 1s a view, partly insection and partly in elevation of the same members as shown in Fig. 21,but showing them in engaging positlon.

Similar letters of reference indicate corresponding parts throughout theseveral figures of the drawings.

Referring to the drawings, the bolt 30 is provided with screw-threads 3lto engage screw-threads 32 of the male or expanding member 33 which ispreferably conical in shape and provided with a circumferentialinclosing iange 34. The other male or expanding member' 35 is alsosubstantially conical in shape and is provided with a circumferentialinclosing flange 36. The male or expanding member 35 is not providedwith screw-threads but ts loosely on the bolt 30 and is movable thereonby means of a pressure applied to the exterior side of the member 35.The expansible or female members 37 and 38 are arranged back to back,and are inclosed by the male or expanding members and by their flangesand each have a circumferential flange 83. By moving the expandingmembers 33 and 35 toward each other, the expansible members 37 and 38are compressed therebetween and are forced against the walls of the holeand against all parts of the expanding members and bolt which liebetween and inclosed by the flanges 34- and 36. In certain cases it hasbeen found in this formi-of construction that it is desirable to removethe bolt from the unit without, however, changing the positions of theother parts of the unit relatively .to each once removed it wasdiiiicult, if not impossible, to replace the same in exactly theposition to insure the true engagement of the interior screw-threads ofthe bolt with the interior screw-threads of male or expanding member.

In order to prevent the disengagement of the expanding members theimprovement consists in providing the expanding members with recesses orprojections into or around which the lmaterial of the expansible memberis forced when the expansible member is compressed between the expandingmembers. By the material being forced into the recesses or aroundprojections the expanding member is held securely in position and willnot become disengaged when the bolt is' removed.

In the construction illustrated for the screw-threaded expanding member33 in Figs. 1 and 2, and for the smooth-bore expanding member 35, inFigs. 5 and 6, an annular groove 46 is provided in the outer surface ofthe member 33 or 35, adjacent to the flange 34 or 36 respectively. Thisgroove forms the recess into which the material of the correspondingexpansible member 37 or 38 is adapted to be crowded.

As shown in Figs. 7 to 10 inclusive, as also in Figs. 21 and 22,recesses 45 are formed at diametrically opposite points on the taperingouter surface of the ex anding member 33 or 35, adjacent to the ange 34or 36 respectively.

According to Figs. 11 to 14 inclusive, the expanding member 33 or 35 isformed, at a slight distance from the flange 34 or 36 respectively, witha circumferential annular rib 47 a or 48 respectively, thereby formingbetween the flange 34 or 36 and the rib 47a or 48, an annular groove 47or 48 respectively corresponding to the groove 46 of Figs. 1, 2, 5 and6. Again, in Figs. 15 and 16, the member 35 is shown provided atdiametrically opposite points with sets' of proj ectionsv 49a, each setcomprising two projections alining lengthwise and separated so as toleave a space 49. One of the projections 49a is contiguous to the flange36. It will be obvious that the same construction may be applied to thethreaded member 33.

The member 33 shown in Figs. 17' and 18 is provided at each of tWodiametrically opposite points, with a single longitudinal within certainlimits.

projection 50 contiguous to the flan e 34. The same construction may ofcourse e applied tothe member 35. Finally, the expanding member 35represented in Figs. 19 and 2O is provided at dlametrically oppositepoints of its outer surface, adjacent to the lia-nge 36, with recesses51 of large curvature lengthwise of said member. Evidently the member 33may be provided with recesses of the -same character.-Av

In every one ofthe constructions illustrated by Figs. 1, '2 and 5 to 22inclusive, those surfaces of the expanding members which are adaptetd toengage the expansible members, are provided with'locking formations(recesses in most of the' constructions shown, although projections maybe used exclusively as in Figs. 17 and 18) with which the expansiblematerial becomes interlocked in the application of the bolt, asshown inFig. 22. It then becomes possible to unscrewl the bolt proper 30 fromthe member 33 Without disturbingl the relation of the other parts (33,35, 3 7, 38) to each other. Thus the bolt 30 maybe readilyv re-inserted,since the other parts'will be found in their original holding position.ll'

Figs. 3, 4, 21 and 22 illustrate another feature of our invention, whichrelates 'to the formation of a friction rim on the expansible member. Asstated above, each o'f the members 37 38 is provided with acircumferential ange 83. Fig. 2l shows that these anges are located atthe abutting ends of the two expansible members.V The two flangestogether form a friction rim which engages the wall of the hole in whichthe pressible, the friction rim will become fiatis forced outwardagainst the wall of the hole (see Fig. 22) by the pressure `exertedaxially of the expanding members A33, 35.`

The expansible member will thus readily adapt itself to holes of dierentdiameters,

Various modifications may be. made j without departing from the natureof our invention as set forth in the appended claims.

We claim: v

1. In an expansion bolt, expanding mem-l bers, expansible members of amaterial capable of being molded, engaged by said expanding members, anda bolt proper detachably connected with one of said expanding members,said expanding members being provided with locln'ng formations to beengaged by the expansible members, capable of being molded thereon topreserve their connection when the bolt proper is removed.

2. In an expansion bolt, an expasible member of a material `capable ofbeing `tened out as the material of said members f/ molded, and anexpanding'member adapted 130 for engagement with said expansible memberand provided with a locking formation in its engaging surface, saidexpansible member capable of being molded around the expanding memberand on the locking formation.

3. In an expansion bolt, an expansible member, an expanding memberadapted for engagement with said expansible member, and recessed in itsengaging surface, said expansible member capable of being molded aroundthe expanding member and of being forced into the recess. 1.

4. In an expansion bolt, an expanding member, an expansible member of amaterial capable of being molded adapted for engagement with saidexpanding member of less diameter than the diameter of the hole, andprovided with a friction rim extending therefrom adapted to engage theWall of the hole into which the expansion bolt is fitted, and a boltproper connected with said expanding member.

5. In an expansion bolt, comprising coni cal members with their beveledportions directed toward each other, said conical members being providedwith locking formations, and expansible members of a material capable ofbeing molded having their base portions adjacent each other, and eachprovided with a rim contacting with the Wall of the hole, said rimacting to guide the expansible member, and the expansible member beingadapted to be forced into the locking formations in the conical members.

6. In an expansion bolt, comprising anexpansible member of a of beingmolded, conical members engaging each end of the expansible membersrovided with locking formations, and a olt for the conical members, thesaid expansible member being adapted to be molded between the conicalmembers and molded into the locking formations in the conical members tosecure a tight hold therewith, and enable the bolt to be removed Withoutdisengagement of the conical members and expansible member.

7. In an expansion bolt, expanding members, expansible members arrangedto engage each other and to be fitted between said expanding members,said expansible members being provided at their abutting ends, withperipheral flanges adapted to form a friction rim, and a bolt properconnected With one of said expanding members.

In testimony, that We claim the foregoing as our invention, We havesigned our names in presence of two subscribing Witnesses.

GABRIEL E. ROHMER. J. FRANCIS BOORAEM. RALPH MORLEY.

Witnesses:

JOHN MURTALH, L. J. MURPHY.

material capable

